00317nam a2200121 a 4500008004100000020001500041050001500056100002600071245001900097260004700116300002300163350000900186120416s0000    ||||||||||||||||| ||    u  a0262060663  aQA 845 For  aForrester, Jay Wright10aWorld dynamics  aCambridge, Mass.bWright-Allen Pressc1971  axiii, 142p. : ill.  a0.00